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88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef MOZILLA_GFX_BASEPOINT_H_
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#define MOZILLA_GFX_BASEPOINT_H_
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#include <cmath>
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#include "mozilla/Attributes.h"
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namespace mozilla {
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namespace gfx {
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/**
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* Do not use this class directly. Subclass it, pass that subclass as the
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* Sub parameter, and only use that subclass. This allows methods to safely
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* cast 'this' to 'Sub*'.
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*/
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template <class T, class Sub>
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struct BasePoint {
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T x, y;
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// Constructors
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MOZ_CONSTEXPR BasePoint() : x(0), y(0) {}
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MOZ_CONSTEXPR BasePoint(T aX, T aY) : x(aX), y(aY) {}
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void MoveTo(T aX, T aY) { x = aX; y = aY; }
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void MoveBy(T aDx, T aDy) { x += aDx; y += aDy; }
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// Note that '=' isn't defined so we'll get the
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// compiler generated default assignment operator
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bool operator==(const Sub& aPoint) const {
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return x == aPoint.x && y == aPoint.y;
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}
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bool operator!=(const Sub& aPoint) const {
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return x != aPoint.x || y != aPoint.y;
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}
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Sub operator+(const Sub& aPoint) const {
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return Sub(x + aPoint.x, y + aPoint.y);
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}
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Sub operator-(const Sub& aPoint) const {
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return Sub(x - aPoint.x, y - aPoint.y);
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}
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Sub& operator+=(const Sub& aPoint) {
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x += aPoint.x;
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y += aPoint.y;
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return *static_cast<Sub*>(this);
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}
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Sub& operator-=(const Sub& aPoint) {
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x -= aPoint.x;
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y -= aPoint.y;
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return *static_cast<Sub*>(this);
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}
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Sub operator*(T aScale) const {
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return Sub(x * aScale, y * aScale);
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}
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Sub operator/(T aScale) const {
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return Sub(x / aScale, y / aScale);
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}
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Sub operator-() const {
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return Sub(-x, -y);
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}
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T Length() const {
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return hypot(x, y);
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}
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// Round() is *not* rounding to nearest integer if the values are negative.
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// They are always rounding as floor(n + 0.5).
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// See https://bugzilla.mozilla.org/show_bug.cgi?id=410748#c14
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Sub& Round() {
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x = static_cast<T>(floor(x + 0.5));
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y = static_cast<T>(floor(y + 0.5));
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return *static_cast<Sub*>(this);
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}
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};
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}
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}
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#endif /* MOZILLA_GFX_BASEPOINT_H_ */
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